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Will calcium silicate building stone work as a foundation for a forge or will they crack with the heat? Answered

I'm looking to build a forge, and I was hoping to use the same bricks that are on the outside of my house. They're Calcium Silicate stones, I don't know if they're meant for fire, because they're primarily decorative on houses these days. Will these crack/ explode in a charcoal fired forge?

I finally got an answer from the makers of the stone, given the e-mail header, I'd say the question got passed along to a couple of people, and is why it took so long to get a reply. They said it's no good as a firebrick. Melting point of Calcium silicates are around 1200 C, so I guess that's why...

I think I've seen it used in gas forges (as insulation board), but it gets delicate so as lining in a charcoal forge it probably wouldn't last. As a brick for siding I imagine that it's closer to concrete than the insulation board I'm thinking of.